TWI427895B - Motor - Google Patents

Description

electric motor

The present invention relates to an electric motor which provides an electric motor which can increase the amount of magnets in the effective area of the rotor to improve efficiency.

In today's industry, it is often necessary to provide power to drive machinery for rotation, or other forms of motion. At this time, the motor is often used as a power source; since the motor can convert electrical energy or magnetic energy into mechanical energy, it is widely used in various industries and electrical appliances. , transportation systems and other devices have become an indispensable device.

The motor can be roughly divided into DC, AC, brushed, or brushless. Generally, the structure of the motor consists of a rotor and a stator. The rotor and the stator are connected to each other to cause the rotor to rotate. Movement, after this rotational motion is conducted, provides the required mechanical energy. Among them, the magnet itself has the characteristics of magnetism, and the magnetic flux is used to provide a magnetic flux. Since the permanent magnet motor can form a large torque in a limited volume, the efficiency and accuracy are also high. It has attracted attention in the market.

Referring to the first figure, a schematic view of a first conventional permanent magnet motor 10 includes a rotor 11 and a stator 12. The rotor 11 is provided with a plurality of magnets 111, and the stator 12 has a ring shape. The structure has a plurality of stator poles 121 on the inner ring, and a coil is arranged on the stator pole 121. After the rotor 11 and the stator 12 are sleeved with each other, an air gap is formed between the rotor 11 and the stator 12, When the coil is energized, the stator poles 121 made of a magnetically conductive material interact with each other by the magnets 111 of the rotor 11, that is, a rotational motion is generated; the rotor 11 may further have a mandrel 13 for rotational movement in the rotor 11. The mechanical energy is conducted out for further use.

The rotor 11 shown in the first figure has a plurality of rotor poles 112. As shown in the figure, a four-pole motor is taken as an example, so that there are four rotor poles 112, and the magnets 111 of the rotor poles 112 are shaped. A few are curved cross sections (consisting of two curved faces of different radii). Since the magnet 111 is placed in the rotor 11, the mechanical strength is high, the mounting and processing are simple, and the cost is low. Only the magnets that are effectively utilized have a small volume and a small magnetic flux, so that the efficiency of the motor cannot be sufficiently improved.

As shown in the second figure, the national patent publication No. 582670, the patent name "permanent magnet rotor type motor", also includes a rotor 11 and a stator 12, the rotor 11 is provided with a plurality of magnets 111, the shape of which It is a fan-shaped cross section. Although the volume of the magnet that is effectively utilized is large, it is easy to generate running noise.

SUMMARY OF THE INVENTION The main object of the present invention is to provide an electric motor which can increase the amount of magnets in the effective area of the rotor to improve efficiency.

The motor of the present invention is provided with a stator, a rotor and a rotating shaft. The rotor is formed with a plurality of rotor magnetic poles, and each of the rotor magnetic poles is provided with a magnet, and each magnet is formed as a concave curved surface near the outer side, and is formed near the inner side. a first, a second, and a third plane, wherein the curved surface and the first and third planes are respectively connected to each other by a connecting surface, and each connecting surface is adjacent to a circumferential surface of the rotor, and the first and third planes The angle formed by the second plane is θ1, θ3, respectively. When the number of rotor poles is P, it satisfies the condition of [90+(180/P) degree, and the tangential slope of the end of the arc near the first plane is less than Or equal to the slope of the first plane, the slope of the end of the arc near the third plane is less than or equal to the slope of the third plane, and the design of the magnet can increase the amount of magnet in the effective area of the rotor to improve the efficiency of the motor. And can reduce the noise during operation.

The features of the present invention can be clearly understood by referring to the drawings and the detailed description of the embodiments.

The present invention is mainly directed to a general motor, as shown in the third and fourth figures, the permanent magnet motor 20 includes: a stator 21, a rotor 22, and a rotating shaft 23; wherein: the stator 21 has an annular body The stator 211 and the plurality of stator poles 212 are respectively protruded from the inside of the main body portion 211, and an accommodation space is formed in each of the stator poles 212.

The rotor 22 is disposed in the accommodating space and has an air gap with each of the stator poles 212. The rotor 22 is formed with a plurality of rotor poles 221, and a magnet 222 is disposed in each of the rotor poles 221.

The number of the plurality of rotor poles 221 is an even number. When the number of rotor poles is P, the number of stator poles satisfies the condition of [P+(P/2)], and the present embodiment takes a four-pole motor as an example, so that there are four Two rotor poles 221, and four stator poles 212.

The plurality of magnets 222 are respectively disposed in the rotor poles 221, and each of the magnets 222 is made of a ferrite material. Each of the magnets 222 is a concave curved surface R1 near the outer side, and first, second, and second sides are formed near the inner side. The three planes S1, S2, and S3, and the curved surface R1 and the first and third planes S1 and S3 are connected to each other by a connecting surface S4, and each connecting surface S4 is adjacent to the circumferential surface of the rotor 22, the first The angle between the third plane S1, S3 and the second plane S2 is θ1, θ3, respectively. When the number of rotor poles 221 is P, it satisfies the condition of [90+(180/P) degree, as shown in the figure. In the embodiment, P=4, and θ1=θ3=135 degrees, and the slope of the tangent (L _A ) of the arc surface R1 close to the end A of the first plane S1 is less than or equal to the slope of the first plane S1, The slope of the tangent (L _B ) of the curved surface R1 near the end B of the third plane S3 is less than or equal to the slope of the third plane S3, and the first plane S1 and the third plane S3 of the adjacent magnet 222 are parallel to each other.

The rotating shaft 23 is provided at the center of the rotor 22 and is integrated with the rotor 22.

As shown in the second embodiment of the fifth figure, the motor 20 is a six-pole motor, so that it has six rotor poles 221 and nine stator poles 212, and the magnets 222 on the rotor poles 221 also meet the above conditions.

Therefore, when the motor of the present invention is operated, the magnet can be used to increase the amount of the magnet in the effective area of the rotor, thereby improving the efficiency of the motor and reducing the noise during operation.

As shown in the sixth figure, the first conventional motor (as shown in the first figure) and the operational efficiency of the motor of the present invention are shown. As shown, the operating efficiency of the motor of the present invention is relatively high at the same operating speed. As shown in the seventh figure, the waveform of the first conventional motor (as shown in the first figure) of the Cogging Torque corresponding to the rotor position is shown. As shown in the eighth figure, the cogging torque of the motor of the present invention corresponds to the waveform of the rotor. The thrust torque is generated by the interaction between the rotor magnet and the stator cogging under the unexcited motor. Torque, this size will affect the vibration noise of the motor. If the value is higher, the performance of the motor may be affected or the vibration and noise may be more serious. If the value is lower, the vibration and noise may be reduced. It can be seen from the figure and the eighth figure that the motor of the present invention has a low dynamic torque, which effectively reduces vibration and reduces noise.

As shown in the ninth figure, the second conventional motor (as shown in the second figure) and the waveform of the rotor of the present invention correspond to the rotor position. As can be seen from the figure, the torque waveform of the motor of the present invention is relatively dense and the amplitude is low, so that the vibration performance of the motor is better when the motor is running at a low speed.

Furthermore, the rotor pole 221 is further provided with a rivet hole 224. The distance between the arc surface R1 of the rotor pole and the rivet hole 224 is greater than 0.5 mm, which can strengthen the structural strength of the rotor 22 or maintain the rivet hole without being worn. In the hollow state, the moment of inertia of the rotor can be reduced and used as a heat sink.

The technical content and technical features of the present invention are disclosed above, but those skilled in the art may still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims

10. . . Permanent magnet motor

11. . . Rotor

111. . . magnet

112. . . Rotor pole

12. . . stator

121. . . Stator pole

13. . . Mandrel

20. . . Permanent magnet motor

twenty one. . . stator

211. . . Annular body

212. . . Stator pole

twenty two. . . Rotor

221. . . Rotor pole

222. . . magnet

224. . . Rivet hole

twenty three. . . Rotating shaft

A. . . End

L _A . . . Tangent

B. . . End

L _AB . . . Tangent

R1. . . Curved surface

S1. . . First plane

S2. . . Second plane

S3. . . Third plane

S4. . . Connection surface

The first figure is a schematic view of the structure of the rotor and the stator in the first conventional motor.

The second figure is a schematic view of the structure of the rotor and the stator in the second conventional motor.

The third figure is a schematic structural view of a first embodiment of a rotor and a stator in an electric motor of the present invention.

The fourth figure is a schematic enlarged view of the first embodiment of the magnet of the present invention.

The fifth drawing is a schematic view showing the structure of the second embodiment of the rotor and the stator in the motor of the present invention.

The sixth figure shows a first conventional motor (as shown in the first figure) and an operational efficiency diagram of the motor of the present invention.

The seventh figure shows a waveform diagram of the first conventional motor (as shown in the first figure) corresponding to the rotor position.

The eighth diagram shows a waveform diagram of the rotor torque of the present invention corresponding to the rotor position.

As shown in the ninth figure, the waveform diagram of the second conventional motor and the motor of the present invention corresponding to the rotor position is shown.

twenty two. . . Rotor

222. . . magnet

224. . . Rivet hole

A. . . End

L _A . . . Tangent

B. . . End

L _AB . . . Tangent

R1. . . Curved surface

S1. . . First plane

S2. . . Second plane

S3. . . Third plane

S4. . . Connection surface

Claims (6)

An electric motor comprising: a stator having an annular main body portion and a plurality of stator magnetic poles, wherein each stator magnetic pole is protruded inside the main body portion, and an accommodation space is formed in each stator magnetic pole; a rotor, the rotor is a substantially circular piece, is disposed in the accommodating space, and has an air gap between the stator poles, the rotor is formed with a plurality of rotor poles, and each of the rotor poles is provided with a magnet a plurality of magnets are respectively disposed in the magnetic poles of the rotors, each of the magnets is a concave curved surface near the outer side, and first, second, and third planes are formed near the inner side, and the curved surface is first and second The three planes are connected to each other by a connecting surface, and each connecting surface is close to the circumferential surface of the rotor. The first and third planes form an angle with the second plane θ1 and θ3, respectively, so that the number of rotor poles is P. When it satisfies the condition of [90+(180/P) degree, and the tangential slope of the end of the arc near the first plane is less than or equal to the slope of the first plane, and the tangent to the end of the arc near the third plane Slope less than or equal to The slope of the three-plane; and a rotating shaft provided at a center line of the rotor, with the rotor set to one. The motor of claim 1, wherein the first plane and the third plane of the adjacent magnet are parallel to each other. The motor of claim 1 or 2, wherein the rotor pole is provided with a rivet hole. The motor of claim 3, wherein the arc surface of the rotor pole is at a distance greater than 0.5 mm from the rivet hole. The motor of claim 1 or 2, wherein the P system is an even number and the number of the stator magnetic poles is [P+(P/2)]. The motor of claim 1 or 2, wherein the magnet is made of ferrite.